Anil Kumar1, M S Gopalakrishnan2, Manish Beniwal3. 1. Department of Neurosurgery, All India Institute of Medical Sciences, Raipur, Chhattisgarh, India. 2. Department of Neurosurgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India. 3. Department of Neurosurgery, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India.